They look like the V-Modas, but that is where the comparison ends. I guess they share the same case manufacturer which is normal in the IEM industry. The driver used is completely different than that in the V-Moda Vibes. The overall sound quality of the RE0s is light years ahead of the Vibe's.

Let me first thank you for such a good Review.
I got my RE2 after reading your Review.
And that opened my eyes (ears in this case) to music.
RE2s have been a part of my life on a daily basis since I got them.
And now I am ready for the next step / another purchase.

The sensitivity of the earphones is actually 3dB/1mW lower than that of the RE1s, that along with the drop in impedance means that it takes roughly the same amount of power to drive them to the same volume level. During the course of my testing I found the RE0s to be just about as hard to drive as the RE1s.

On my iAudio7 I listen at 34/40 volume with RE2s.
Now RE2 is 32 Ohms. I m wondering if iAudio7 would be able to play 64 Ohm RE0 unAmped (Even though there is a free Amp that comes with it... It would beat the purpose of having such low profile iAudio7) ?

Second Question..
I m pretty happy with the tight Bass of RE2
When compared to RE2, does RE0 have same amount or more Bass ?
How would u compare Basses of RE2 and RE0 ?

I love my iAudio7, my main concern is if... it can drive the RE0.
If it can... I m paying for these today.

I do not own an i7 anymore but with my Cowon D2 I get sufficient volume at about 23/50, so my best guess is that the i7 will have enough juice to drive them to like 80% of their potential. They are actually bundled with a FiiO E3 portable headphone amp at the moment, so you can always experiment with the i7 + FiiO combo. The FiiO is not the best headphone amp but it probably elevates the performance a bit.

The difference in my rig between using or not using the RSA Tomahawk is a better defined bass and a more refined midrange. Subtle details, but I think it is worth it using the RE0s with a portable headphone amp.

The RE0s are in a completely different league compared to the RE2s, I think you will find the upgrade worth it if you like a analytical sound signature.

Feel free to report back in this thread if you decide to go for the RE0s and tell us how you like them. Remember they need over 100 hours of burn-in before they sound their best.